Bump Bazelisk version to 1.12.0

Change-Id: Iec59dd5b4328f39edefc8a18585464a84525bde8
diff --git a/jenkins-docker/agent-bazel-nocache/Makefile b/jenkins-docker/agent-bazel-nocache/Makefile
index 568d5da..d085667 100644
--- a/jenkins-docker/agent-bazel-nocache/Makefile
+++ b/jenkins-docker/agent-bazel-nocache/Makefile
@@ -5,7 +5,7 @@
 IMAGE=${PREFIX}/gerrit-ci-agent-bazel:debian-buster-nocache
 BAZEL_VER=5.0.0
 BUILDIFIER_VER=4.0.0
-BAZELISK_VER=1.7.4
+BAZELISK_VER=1.12.0
 NODE_VER=10
 WCT_VER=6.8.0